Mixer.



No. 770,855. PATENTED SEPT. 27, 1904. F. A. HETHBRINGTON.

MIXER.

APPLIOATION FILED T11R29, 1904.

N0 MODEL Frederick A. Hetherington UNITED STATES Patented. September 27, 1904.

PATENT OFFICE.

MIXER.

SPECIFICATION forming part of Letters Patent No. 770,855, dated September 27, 1904,

Application filed February 29, 1904- Serial No. 195,856. (No model.)

To all whom it may concern.-

Be it known that I, FREDERICK A. HETHER- INGTON, a citizen of the United States, residing at Indianapolis, in the county of Marion and State of Indiana,have invented certain new and useful Improvements in Mixers, of which the following is a specification.

In the manufacture of asphalt pavements a lower or bindercourse is made of gravel or broken stone and asphaltic cement, while the topping course is made of sand and asphaltic cement, and it is desirable that the same general pieces of apparatus be used in the mixing of either course. It is, however, necessary to provide the mixer with differently-shaped mixing-blades for each course; and the object of my present invention is to produce a mixer in which the mixing-blades may be readily changed to meet the necessary requirements in the preparation of either course.

The accompanying drawings illustrate my invention. 4

Figure 1 is a transverse section of a mixer constructed in accordance with my invention. Fig. 2 is a section on line 2 2 of Fig. 1; Fig. 3, a similar detail with the mixer-blades removed; Fig. 4, a sectional detail, and Fig. 5 a detail of one of the mixer-blades.

In the drawings, 10 indicates a suitable container or vessel of the usual form provided in its bottom with the usual discharge-openings closed by doors 11. Journaled in the body 10 and extending therethrough is a square or other suitable polygonal shaft 12, the ends of which are turned down to form journals 12, which are supported in suitable bearings 13. At least one of the bearings 13 (both are so shown in the drawings) is in the form of a gland, which fits within an opening 10' somewhat larger than the greater diameter of the central portion of the shaft. Bearing 13 is provided with a suitable flange 13, by means of which it may be detachably bolted by bolts 14 to the main body, the arrangement being such that by detaching one of the glands 13 the shaft 12 may be pulled axially from the main body. In order that the mixer-blades 15 may not be disassembled by the movement of the shaft 14, said blades are clamped upon a hollow shaft 16, which is of such size as to receive the middle portion of shaft 12.

This hollow shaft 16 may be formed in any desired manner; but I prefer to form the same by means of a pair of angle-irons 16 and 16 placed together, as clearly shown in Fig. 4. The blades 15 are then provided at their inner ends with three rectangular transverse grooves 15, which may be fitted upon the corners of the hollow shaft 16 or upon the sides, as clearly indicated in Fig. 1, and then clamped together by suitable bolts 15, the arms or blades thus serving to hold the angleirons 16 and 16 together and produce thereby a substantially integral hollow shaft. This makes an exceedingly cheap construction, yet fully as efiicient as a solid shaft.

In operation when it is desired to change i the mixer-blades it is merely necessary for the operator to remove one of the glands 13, whereupon the shaft 12 may be withdrawn from the mixer and the entire set of the mixerblades bodily withdrawn transversely from the casing 10 and the new set substituted, whereupon the shaft 12 is returned to position and the gland 13 rebolted in position.

It will be readily understood that the angleirons need not be of the simple form shown, but may be of any desired mating cross-section to form the hollow shaft structure.

I claim as my invention 1. In a mixer, the combination, with the main casing having suitable shaft-bearings at opposite sides thereof, and one of said bearings removable, of a shaft journaled in said bearings and having a polygonal middle portion lying within the casing and of larger dimensions than the bore of the removable hearing, and a mixer structure mounted upon said middle portion within the casing, whereby the removable hearing may be removed, the shaft axially withdrawn from the casing and mixer structure and the mixer structure transversely withdrawn from the casing.

2. In a mixer, the combination, with the main casing having shaft-bearings at opposite sides thereof and one of said bearings removable therefrom, of a shaft journaled in said bearings and having a polygonal middle portion of greater dimensions than the bore of the removable bearing, a hollow shaft sleeved upon said polygonal portion between the walls of the casing, and mixer-blades detachably secured to said hollow shaft, whereby the removable hearing may be removed, the shaft axially Withdrawn from the casing and mixer structure and the mixer structure transversely withdrawn from the casing.

3. In a mixer, the combination, with the main casing, of a shaft journaled therein and axially removable therefrom, a hollow shaft composed of a pair of angle-irons, a plurality of mixer-blades, clamped upon said angleirons so as to hold them together and thereby form a hollow shaft adapted to receive the first-mentioned shaft, and from which said 

